21594712373 has 8 divisors (see below), whose sum is σ = 23257800216. Its totient is φ = 19931904000.

The previous prime is 21594712361. The next prime is 21594712429. The reversal of 21594712373 is 37321749512.

It can be written as a sum of positive squares in 4 ways, for example, as 2168485489 + 19426226884 = 46567^2 + 139378^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21594712373 - 2¹⁴ = 21594695989 is a prime.

It is a super-3 number, since 3×21594712373³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21594712973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107273 + ... + 233873.

It is an arithmetic number, because the mean of its divisors is an integer number (2907225027).

Almost surely, 2^21594712373 is an apocalyptic number.

It is an amenable number.

21594712373 is a deficient number, since it is larger than the sum of its proper divisors (1663087843).

21594712373 is a wasteful number, since it uses less digits than its factorization.

21594712373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139735.

The product of its digits is 317520, while the sum is 44.

The spelling of 21594712373 in words is "twenty-one billion, five hundred ninety-four million, seven hundred twelve thousand, three hundred seventy-three".